Electrochemical Water Oxidation Catalyzed by an In Situ Generated [alpha]-Co(OH)2 Film on Zeolite-Y Surface

The design and synthesis of an efficient and robust water-oxidation catalyst with inexpensive materials remains an important challenge in the context of artificial photosynthesis. Herein, a simple but unique technique is reported to in situ generate a thin-film of [alpha]-Co(OH)2 on the surface of z...

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Bibliographic Details
Published inChemistry : a European journal Vol. 23; no. 33; p. 8051
Main Authors Bose, Suranjana, Debgupta, Joyashish, Ramsundar, Rani M, Das, Samar K
Format Journal Article
LanguageEnglish
Published Weinheim Wiley Subscription Services, Inc 12.06.2017
Subjects
Catalysts
Catalytic activity
Chemical composition
Chemical synthesis
Chemistry
Cobalt
Electrocatalysts
Electrochemistry
Evolution
Oxidation
Oxygen
Photosynthesis
Reaction kinetics
Robustness
Thin films
Zeolites
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Summary:The design and synthesis of an efficient and robust water-oxidation catalyst with inexpensive materials remains an important challenge in the context of artificial photosynthesis. Herein, a simple but unique technique is reported to in situ generate a thin-film of [alpha]-Co(OH)2 on the surface of zeolite-Y [hereafter referred to as Y-[alpha]-Co(OH)2] that acts as an efficient and stable catalyst for electrochemical water oxidation in alkaline medium. Catalyst Y-[alpha]-Co(OH)2 is so stable that it retains its catalytic activity even after 2000cyclic voltammetric cycles of water oxidation. Expectedly, the chemical composition of [alpha]-Co(OH)2 on the surface of zeolite-Y remains same as that of parent Y-[alpha]-Co(OH)2 after 2000electrocatalytic cycles. A Tafel slope as low as 59mVdecade-1 in 0.1m KOH (pH13) suggests faster oxygen evolution kinetics (overpotential=329mV; turnover frequency=0.35mol O2 (mol Co)-1s-1 at 1mAcm-2) than the existing [alpha]-Co(OH)2-based electrocatalysts operating in alkaline medium.
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ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201700955